The occasion speaks thee, and
My strong imagination sees a crown
Dropping upon thy head.
– William Shakespeare
The Tempest, Act 2, Scene 1. Antonio tells Sebastian that opportunity is knocking at his door and he imagines a crown coming to rest on Sebastian’s head. With King Alonso having fallen asleep Ariel’s playing of "solemn music," the treacherous Antonio is suggesting that this is Sebastian’s chance to ascend to the throne by killing his brother.